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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
16/02/2000 |
Data da última atualização: |
16/02/2000 |
Autoria: |
WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. |
Título: |
Aggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Geoderma, Amsterdam, v.90, p.277-290, 1999. |
Idioma: |
Inglês |
Conteúdo: |
In the Cerrado savanna region in Brazil, the effects of different land use on Oxisol aggregation were studied, using laser diffraction grain size analyses. The topsoil of plowed systems had significantly lower amount of macroaggrehates (2000-194 um) and a significantly higher amount of soil in the microaggregate size and and primary particle fraction (<76 um) compared to pastures and the native Cerrado. In plowed systems low in soil organic carbon (SOC), lime had a negative effect on aggregate stability. Lime addition had no effect on topsoil aggregation in land use systems that were not plowed regularly and generally had SOC content. For all the studied topsoils, pHKCl was positively correlated with the amount of clay dispersed after 3 h of shaking in water. SOC did not influence clay dispersion in the range of soils studied. In continuous cropping systems in the Cerrado region, with a combination of mechanical stress and low SOC, liming will cause an increase in small aggregates and primary particles and hence contribuite to a destabilization of the soil structure. |
Palavras-Chave: |
Ploughing. |
Thesagro: |
Aradura; Calagem; Cerrado; Estrutura do Solo; Matéria Orgânica. |
Thesaurus Nal: |
liming; organic matter; soil structure. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01860naa a2200289 a 4500 001 1555057 005 2000-02-16 008 1999 bl --- 0-- u #d 100 1 $aWESTERHOF, R. 245 $aAggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil. 260 $c1999 520 $aIn the Cerrado savanna region in Brazil, the effects of different land use on Oxisol aggregation were studied, using laser diffraction grain size analyses. The topsoil of plowed systems had significantly lower amount of macroaggrehates (2000-194 um) and a significantly higher amount of soil in the microaggregate size and and primary particle fraction (<76 um) compared to pastures and the native Cerrado. In plowed systems low in soil organic carbon (SOC), lime had a negative effect on aggregate stability. Lime addition had no effect on topsoil aggregation in land use systems that were not plowed regularly and generally had SOC content. For all the studied topsoils, pHKCl was positively correlated with the amount of clay dispersed after 3 h of shaking in water. SOC did not influence clay dispersion in the range of soils studied. In continuous cropping systems in the Cerrado region, with a combination of mechanical stress and low SOC, liming will cause an increase in small aggregates and primary particles and hence contribuite to a destabilization of the soil structure. 650 $aliming 650 $aorganic matter 650 $asoil structure 650 $aAradura 650 $aCalagem 650 $aCerrado 650 $aEstrutura do Solo 650 $aMatéria Orgânica 653 $aPloughing 700 1 $aBUURMAN, P. 700 1 $aGRIETHUYSEN, C. van 700 1 $aAYARZA, M. A. 700 1 $aVILELA, L. 700 1 $aZECH, W. 773 $tGeoderma, Amsterdam$gv.90, p.277-290, 1999.
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Registros recuperados : 50 | |
21. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.64-76.Biblioteca(s): Embrapa Cerrados. |
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23. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; VILELA, L.; LIMA, S. do C.; ZECH, W. Chemical fractionation of phosphorus, sulphur, and molybdenum in Brazilian savannah oxisols under different land use. Geoderma, Amsterdam, v. 96, p. 31-46, 2000.Biblioteca(s): Embrapa Cerrados. |
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24. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | ARAUJO, A. G. de; AYARZA, M. A.; FRIESEN, D. K.; VILELA, L. Fracoes organicas e inorganicas de fosforo em um solo de cerrado sob diferentes sistemas de manejo. In: SIMPOSIO SOBRE O CERRADO, 8.; INTERNATIONAL SYMPOSIUM ON TROPICAL SAVANNAS, 1., 1996, Brasilia, DF. Biodiversidade e producao sustentavel de alimentos e fibras nos Cerrados: anais... Planaltina: EMBRAPA-CPAC, 1996. p.319-322.Biblioteca(s): Embrapa Cerrados. |
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25. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | SMITH, J.; CADAVID, J. V.; AYARZA, M.; AGUIAR, J. L. P. de; ROSA, R. Land use change in soybean production systems in the Brazilian savanna: the role of policy and market conditions. Journal of Sustainable Agriculture, Binghamton, v.15, n.2/3, p.95-117, 1999.Biblioteca(s): Embrapa Cerrados. |
| ![Visualizar detalhes do registro](/consulta/web/img/visualizar.png) ![Imprime registro no formato completo](/consulta/web/img/print.png) |
26. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | LILIENFEIN, J.; WILCKE, W.; NEUFELDT, M.; AYARZA, M. A.; ZECH, W. Land-use effects on organic carbon, nitrogen, and sulphur concentrations in macroaggregates of differently textured Brazilian oxisols. Journal of Plant Nutrition and Soil Science, Berlin, v.161, n.2, p.165-171, 1998.Biblioteca(s): Embrapa Cerrados. |
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29. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | AYARZA, M. A.; VILELA, L.; BARCELLOS, A. de O.; BALBINO, L. C.; BROSSARD, M.; PASINI, A. Integration culture-elevage dans les cerrados au Brasil: une solution pour des systemes durables. Agriculture et Developpement, Montpellier, n.18, p.91-98, juin 1998.Biblioteca(s): Embrapa Cerrados. |
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30. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | AYARZA, M. A.; VILELA, L.; BARCELLOS, A. de O.; BALBINO, L. C.; BROSSARD, M.; PASINI, A. Integration culture-elevage dans les cerrados au Bresil: une solution pour des systemes durables. Agriculture et Developpement, Montpellier, n. 18, p. 91-98, juin 1998.Tipo: Artigo em Periódico Indexado |
Biblioteca(s): Embrapa Arroz e Feijão. |
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33. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | PIZARRO, E. A.; AYARZA, M. A.; SPAIN, J. M.; CARVALHO, M. A.; SOUZA, M. A. de. Efecto de la irrigacion en la produccion de semillas de Stylosanthes guianensis cv. Mineirao. Pasturas Tropicales, Cali, v.15, n.3, p.27-28, 1993.Biblioteca(s): Embrapa Cerrados. |
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34. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | RENZ, T. E.; NEUFELDT, H.; AYARZA, M. A.; RESCK, D. V. S.; ZECH, W. Microbial biomass, microbial activity, and carbon pools under different land-use systems in the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.187-197.Biblioteca(s): Embrapa Cerrados. |
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36. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | FUHRMANN, S.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; ZECH, W. Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.110-122.Biblioteca(s): Embrapa Cerrados. |
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38. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; VILELA, L.; LIMA, S. do C.; ZECK, W. Soil acidification in Pinus caribaea forests on Brazilian savanna oxisols. Forest Ecology and Management, Amsterdam, v. 128, p. 145-157, 2000.Biblioteca(s): Embrapa Cerrados. |
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39. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | AYARZA, M. A.; VILELA, L.; PIZARRO, E. A.; COSTA, P. H. da. Sistemas agropastoriles basados en leguminosas de usos multiples. In: GUIMARAES, E.P.; SANZ, J.I.; RAO, I.M.; AMEZQUITA, M.C.; AMEZQUITA, E., ed. Sistemas agropastoriles en sabanas tropicales de America Latina. Cali: CIAT/Brasilia: Embrapa, 1999. p.175-193.Biblioteca(s): Embrapa Cerrados. |
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Registros recuperados : 50 | |
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